Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Narrative (Details)

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Employee Benefit Plans - Narrative (Details) (USD $)
Share data in Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Jan. 24, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]        
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax   $ (2,049,000,000) $ 65,000,000 $ 444,000,000
Increase (decrease) net pension assets, amended 1,300,000,000      
Increase in AOCI, net of tax 832,000,000      
Curtailments (58,000,000)      
Weighted-average discount rate     4.95%  
Prior Years Market Gains Losses Recognized By Asset Valuation Method For Qualified Pension Plans   60.00%    
Remaining Market Gains Losses Recognized By Asset Valuation Method For Qualified Pension Plans   40.00%    
Unrecognized Gain Loss Percentage For Post Retirement Health Care Plan   50.00%    
Defined Contribution Plan Decline in Rates Threshold to Analyze Significant Impact to Plan, Percent   0.25%    
Defined Contribution Plan Decline in Expected Return Threshold to Analyze Significant Impact to Plan, Percent   0.25%    
Postretirement Plan Decline in Rates Threshold to Analyze Significant Impact to Plan, Percent   0.25%    
Defined Benefit Plan Decline in Rates Threshold to Analyze Significant Impact to Plan, Percent   0.25%    
Other comprehensive income (loss), net of tax   (5,660,000,000) 2,640,000,000 (5,371,000,000)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent   (2,049,000,000) 65,000,000 444,000,000
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]        
Effect of One Percentage Point Increase on Service and Interest Cost Components   2,000,000    
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   54,000,000    
Effect of One Percentage Point Decrease on Service and Interest Cost Components   2,000,000    
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   47,000,000    
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]        
Contribution To Qualified Defined Contribution Plans Cash   1,073,000,000 886,000,000 723,000,000
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)   410,000,000 174,000,000  
Common Stock Held By Defined Contribution Plans Shares   235 235  
Payments To Plans For Dividends On Common Stock   10,000,000 10,000,000 9,000,000
LT Return On Asset New [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Weighted-average, expected long-term return on assets   0.00%    
LT Return On Asset Old [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Weighted-average, expected long-term return on assets   0.00% 0.00%  
Nonqualified and Other Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Curtailments   (7,000,000) [1] 0 [1]  
Weighted-average discount rate   4.55% [1] 3.65% [1]  
Weighted-average, expected long-term return on assets   3.75% 5.25% 5.25%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   103,000,000    
Qualified Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Curtailments   17,000,000 [1] (889,000,000) [1]  
Weighted-average discount rate   4.85% [1] 4.00% [1]  
Weighted-average, expected long-term return on assets   6.50% 8.00% 8.00%
Increase In Plan Assets With Respect To Decline In Discount Rate   7,000,000    
Increase In Plan Assets With Respect To Decline In Expected Return   41,000,000    
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]        
Defined Benefit Plan, Amount of Employer and Related Party Securities Included in Plan Assets   200,000,000 156,000,000  
Defined Benefit Plan, Equity Securities   1.10% 0.96%  
Postretirement Health and Life Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Curtailments   0 [1] 0 [1]  
Weighted-average discount rate   4.50% [1] 3.65% [1]  
Weighted-average, expected long-term return on assets   6.50% 8.00% 8.00%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   106,000,000    
Increase In Plan Assets With Respect To Decline In Expected Return   9,000,000    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year   7.00%    
Reduction In Assumed Health Care Cost Trend Rate   5.00%    
Non-U.S. Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Curtailments   (116,000,000) [1] 0 [1]  
Weighted-average discount rate   4.30% [1] 4.23% [1]  
Weighted-average, expected long-term return on assets   5.50% 6.65% 6.58%
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year   $ 83,000,000    
[1] The measurement date for the Qualified Pension Plan, Non-U.S. Pension Plans, Nonqualified and Other Pension Plans, and Postretirement Health and Life Plans was December 31 of each year reported.